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@DHSayer The code disassembly and annotations are correct, but some of the takeaways are not quite on point. The table in tetrisconcept.net/threads/random… is more accurate conceptually, but I think last time I talked to colour_thief about it we found some slightly inaccuracy/miscalculation.
@DHSayer Certain pieces are more likely to appear after another due to a variety of factors. Ex: The re-roll step always being one LFSR shift after the first means that only certain bit patterns can be projected from it (previous value shifted down once, and either a 0/1 in the MSB).
@DHSayer So, it's possible to compute how likely it is to be in any previous state (LFSR states should be roughly equally likely, piece index counts are equally likely, next state can be projected forward directly from the set of all hypothetical previous states) and find the equilibrium.
@DHSayer Here's what I calculated for general probabilities last time I poked around with it in a chat with colour_thief:
T - 14.72372445%
J - 14.32722322%
Z - 14.2572419%
O - 14.30045783%
S - 14.70184498%
L - 13.81087287%
I - 13.87863476%
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